合金鐵迅速分析法

概要

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(1) Analysis of Ferrotitauium ; H_2SO_4 solution of ferrotitanium is reduced by amalga-matedzinc in the reductor and is titrated by KMnO_4, then Fe+Ti=a (Fe^2→Fe^3, Ti^3→Ti^4) is obtained. After the reduction in the same manner Ti^3 only is oxidized with sir-vibration (Ti^3→Ti^4) and again is titrated with KMnO_4, then Fe=b (Fe^2→Fe^3) is obtained. (2) Analysis of Ferrovanadium ; Ferrovanadium as well as ferrotitanium can be titrated in the same manner, then Fe+3V=a (Fe^2→Fe^3, V^2→V^5) is obtained. After reduction of the solution in the same manner, V^2 only is oxidized with air-vibration (V^2→V^4) using CuSO_4 as catalyser, then Fe+V=b (Fe^2→Fe^3, V^4→V^5) is obtained. (3) Analysis of Ferrochromium ; HCL solution of ferrochromium is reduced by amalgamatedzinc in the reduction and titrated with K_2Cr_2O_7 using diphenylamine as indicator, then Fe+Cr=a (Fe^2→Fe^3, Cr^2→Cr^3) is obtained. But as chromium has not been reduced to Cr^2, so that the proper correction must be made. After the HCI solution is reduced as same manner, Cr^2 only is oxidized with air-vibration (Cr^2→Cr^3), and titrated by K_2Cr_2O_7 then Fe=b (Fe^2→Fe^3) is obtained.
1948-06-30